body {
    font: 13px sans-serif;
    position: relative;
    width: 100%;
    height: 100%;
  }
  
  .node {
    fill: #000;
    cursor: crosshair;
  }
  
  .node_selected {
    fill: #ff7f0e;
    stroke: #ff7f0e;
  }
  
  .drag_line {
    stroke: #999;
    stroke-width: 5;
    pointer-events: none;
  }
  
  .drag_line_hidden {
    stroke: #999;
    stroke-width: 0;
    pointer-events: none;
  }
  
  .link {
    stroke: #999;
    stroke-width: 5;
    cursor: crosshair;
  }
  
  .link_selected {
    stroke: #ff7f0e;
  }